101 Basic Series - Module 22 - CEU Education
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1
The units in an MCC can contain starters, circuit breakers, disconnect switches, drives, PLC's, operator interface panels, and device communication products.
2
An enclosure rating that is designed for outdoor use, made of sheet steel, have a gasket on the cover, and may have a blank cover plate attached to the top and most have knockouts on the bottom.
3
Pull-apart terminal blocks are mounted such that they have access to the vertical wireway, and if a unit is pulled for maintenance, the wiring can remain within the center.
4
A column section in an MCC assembly is also referred to as a ________.
5
An enclosure rating that is used indoors where unusual conditions do not exist, are made of sheet steel, and depending on size may have knockouts for electrical cabling, would be.
6
Multi-Pak group control can have 4 or 6 starters mounted in NEMA sizes 1 through 4 enclosures.
7
The smallest units in an MCC measure 6" high and can increase in size by 6" up to 72".
8
In an MCC, a motor control compartment is often referred to as a ________.
9
Combination starters can have fusible or non-fusible disconnects.
10
NEMA establishes local electric codes that determine the proper selection of an enclosure type.
11
NEMA assigns IP classifications for enclosures, while IEC uses a Type system.
12
The ________  horizontal wireways are isolated from the main horizontal bus that runs through each section of the structure.
13
The vertical wireway in an MCC is located on the ________ of each section and extends the full height.
14
These attach plug-in units to the MCC power bus bars.
15
IEC and NEMA have set standards for the protection of devices in various environmental situations.
16
________ wiring means there are no terminal blocks in the unit and control and load connections are made directly to the devices.
17
A typical custom panel has a fault current rating of 15,000 amps, much higher than that of an MCC.
18
The main components of enclosed control include the following, EXCEPT:
19
While the depth of an MCC can vary from 16" to 21", a typical MCC section is which of the following:
20
________ wiring means that there are terminal blocks within each unit, and the devices are factory wired to them.